Truth

I could not help quoting yesterday the very saying of Jesus, "I am the Road, also the Truth, also the Life."

Alas, that ten words summarize the entire concept of theology, which encompasses three domains of god (in that order):

• the things we should do (ethics)
  
• the law of the nature (science)
  
• the eternity of life

Answers to these three questions are, I would say, basic human psychological (or spiritual, if you prefer) needs. All formal religions try to cover each and every one of them.

To go one step further, that explains why Buddhism flourished in China. Confucianism, although often regarded as a religion, focuses only on the first question; Taoism also covers the second - but that very last aspect remains untouched. That's why when the idea of Sukhavati (極樂世界) by Gautama Buddha reached China, it was received with so much enthusiasm.

You see, that becomes our Three Religions (三教 儒釋道).

PS. Have you heard of bundling selling (綑綁銷售) ?